docs: def extract_args(cls, *args):
          """
          Takes any arguments like a model and crud, or just one of
          those, in any order, and return a model and crud.
          """
          model = None
          crudbuilder = None
  
          for arg in args:
              if issubclass(arg, models.Model):
                  model = arg
              else:
                  crudbuilder = arg
  
          return [model, crudbuilder]